1997 Mercedes Benz S420

Heater problem
1997 Mercedes Benz S420 V8 Automatic 176000 miles

Hi, I have a 97 mercedes benz s420 and my problem is that when I turn on the heat to HI and the fan to full, on the driver side vent I get good air flow and heat, in the middle left one I also get good air flow and heat however on the middle right I get low air flow and hardly any heat and on the passenger vent I dont get any air flow or heat. Please help me! Thanks
February 13, 2010.

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